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#41
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My balanced rotating assembly did not have any balancing info included and was found to be out 9 grams at the front and 12 grams at the rear.
Also to note, all the new “neutral balance” parts were not much better… balancer was out 6 grams while the flywheel was out 12 grams, and pressure plate out 7 grams. This was from a short block kit that was supposed to be ready to assemble purchased about 20 years ago. After this I don’t trust that any assembly is ready to run and properly balanced. |
#42
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What vendor?
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '69 LeMans Vert, 350, #47 heads: work in progress |
#43
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thanks for posting that vicgto. what pistons did eagle offer you with their rods and crankshaft out of curiosity.
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69 Gto, 390 posi gears,th400 w/jim hand converter/406 pontiac/#64 HEADS/ 10:1 compression/ 190 PSI with/ TRW 160 thou domes / hooker headers 1 7/8, PRW 1.5 rockers, 405 Crower Springs, Holley 750 vac with proform upgrade, Performer RPM on points / 284 H Single Pattern Crane |
#44
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Quote:
The only source I know of says that 1970 Pontiac engines were balanced to "within 1/2 inch-ounces". 9:47 of this video--just after the audio comes back. https://www.youtube.com/watch?v=9LuXf6gJ-jg A half-ounce is about 20 grams. Fine for a grocery-getter. Maybe not adequate for anything that gets run to higher RPM on a semi-regular basis. |
#45
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Pistons are forged JE/SRP
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1972 GTO 468 2 Bolt Main w/Eagle rotating assy SD Ported 295 KRE D Ports 10.8 CR OF Hydraulic roller w/ 1.65 stainless rockers Performer RPM Intake Holley 3310 780 Vacuum Secondary TH400 with 10" Continental Convertor 8.2 BOP 4 pinion 10 Bolt with 3.36 gears 11.428/118.95/1.618 |
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